<template>
  <div class="outer">
    <!-- 三级分类导航 -->
    <TypeNav />
    <div class="main">
      <div class="py-container">
        <!--面包屑导航-->
        <div class="bread">
          <ul class="fl sui-breadcrumb">
            <li>
              <span href="#">全部结果</span>
            </li>
          </ul>
          <ul class="fl sui-tag">
            <!-- 
              分类
             -->
            <li class="with-x" v-if="$route.query.categoryName">
              分类：{{ $route.query.categoryName }}<i @click="delCategory">×</i>
            </li>
            <!-- 关键字 -->
            <li class="with-x" v-if="$route.query.keyword">
              关键字：{{ $route.query.keyword }}<i @click="delKeyword">×</i>
            </li>
            <!-- 品牌 -->
            <li class="with-x" v-if="searchOptions.trademark">
              品牌：{{ searchOptions.trademark.split(":")[1]
              }}<i @click="delTrademark">×</i>
            </li>
            <!-- 属性 -->
            <!-- 
              v-for v-if 优先级 v-for 更高
              v-for v-if 不建议一起使用。
             -->
            <li
              class="with-x"
              v-for="(prop, index) in searchOptions.props"
              :key="prop"
            >
              {{ prop.split(":")[2] }}: {{ prop.split(":")[1]
              }}<i @click="delProp(index)">×</i>
            </li>
          </ul>
        </div>

        <!-- 搜索器 -->
        <SearchSelector
          :trademarkList="trademarkList"
          :attrsList="attrsList"
          @searchTrademark="searchTrademark"
          @searchProp="searchProp"
        />

        <!--商品展示区-->
        <div class="details clearfix">
          <!-- 列表操作区 -->
          <div class="sui-navbar">
            <div class="navbar-inner filter">
              <ul class="sui-nav">
                <li
                  :class="{
                    active: order[0] === '1',
                  }"
                  @click="setOrder('1')"
                >
                  <a>
                    综合
                    <i
                      v-show="order[0] === '1'"
                      :class="[
                        'iconfont',
                        `icon-direction-${order[1] === 'asc' ? 'up' : 'down'}`,
                      ]"
                    ></i>
                  </a>
                </li>
                <li>
                  <a>销量</a>
                </li>
                <li>
                  <a>新品</a>
                </li>
                <li>
                  <a>评价</a>
                </li>
                <li
                  :class="{
                    active: order[0] === '2',
                  }"
                  @click="setOrder('2')"
                >
                  <a>
                    价格
                    <i
                      v-show="order[0] === '2'"
                      :class="[
                        'iconfont',
                        `icon-direction-${order[1] === 'asc' ? 'up' : 'down'}`,
                      ]"
                    ></i>
                  </a>
                </li>
              </ul>
            </div>
          </div>
          <!-- 商品列表 -->
          <div class="goods-list">
            <ul class="yui3-g">
              <li class="yui3-u-1-5" v-for="goods in goodsList" :key="goods.id">
                <div class="list-wrap">
                  <div class="p-img">
                    <router-link
                      :to="{
                        name: 'Detail',
                        params: {
                          // 携带params参数需要使用命名路由跳转
                          // 要想携带params参数，必须配置路由配置 /:id
                          id: goods.id,
                        },
                      }"
                    >
                      <img :src="goods.defaultImg" class="goods-img" />
                    </router-link>
                  </div>
                  <div class="price">
                    <strong>
                      <em>¥</em>
                      <i>{{ goods.price }}</i>
                    </strong>
                  </div>
                  <div class="attr">
                    <a>{{ goods.title }}</a>
                  </div>
                  <div class="commit">
                    <i class="command">已有<span>2000</span>人评价</i>
                  </div>
                </div>
              </li>
            </ul>
          </div>
          <!-- 分页器 -->
          <div class="fr page">
            <!-- 
              @size-change="handleSizeChange"         当 page-size 发送变化时触发的事件
              @current-change="handleCurrentChange"   当 current-page 发送变化时触发的事件
              :current-page="searchOptions.pageNo"    当前页码
              :page-sizes="[5, 10, 15, 20]"           每页条数的选项
              :page-size="searchOptions.pageSize"     每页条数
              layout="total, sizes, prev, pager, next, jumper" 需要加载的分页器哪些组件
              :total="total"                          总数
             -->
            <!-- <el-pagination
              @size-change="handleSizeChange"
              @current-change="handleCurrentChange"
              :current-page="searchOptions.pageNo"
              :page-sizes="[5, 10, 15, 20]"
              :page-size="searchOptions.pageSize"
              layout="prev, pager, next, sizes, total"
              :total="total"
              background
            >
            </el-pagination> -->
            <Pagination
              :current-page="searchOptions.pageNo"
              :page-size="searchOptions.pageSize"
              :page-sizes="[5, 10, 15, 20]"
              :total="total"
              @size-change="handleSizeChange"
              @current-change="handleCurrentChange"
            />
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// import _ from "lodash"; // 完整引入
import debounce from "lodash/debounce"; // 按需引入
import SearchSelector from "./SearchSelector";
import TypeNav from "@/components/TypeNav";
import Pagination from "@/components/Pagination";
import { reqSearchGoodsList } from "@/api/search";

export default {
  name: "SSearch",
  components: {
    SearchSelector,
    TypeNav,
    Pagination,
  },
  mounted() {
    this.searchGoodsList();
  },
  data() {
    return {
      trademarkList: [],
      attrsList: [],
      goodsList: [],
      searchOptions: {
        // 分类和关键字参数直接从路由参数中获取
        // 分类
        // category1Id: undefined,
        // category2Id: undefined,
        // category3Id: undefined,
        // categoryName: "",
        // // 关键字
        // keyword: "",
        // 属性
        // '属性id:属性值:属性名'
        props: [],
        // 品牌
        // '品牌id:品牌名称'
        trademark: "",
        // 排序
        // 排序类型：1综合 2价格  排序标识：asc升序 desc降序
        order: "1:desc",
        // 分页
        pageNo: 1,
        pageSize: 5,
      },
      total: 0,
    };
  },
  methods: {
    // 封装统一搜索函数
    async searchGoodsList() {
      const res = await reqSearchGoodsList({
        ...this.searchOptions,
        ...this.$route.query,
      });
      this.trademarkList = res.trademarkList;
      this.attrsList = res.attrsList;
      this.goodsList = res.goodsList;
      this.total = res.total;
    },
    // 品牌搜索
    searchTrademark(tm) {
      // 如果点击的是同一个品牌，就不重新搜索了
      if (this.searchOptions.trademark === tm) return;
      // tm 品牌搜索条件
      this.searchOptions.trademark = tm;
      this.searchGoodsList();
    },
    // 属性搜索
    searchProp(prop) {
      // forEach / push / splice / sort ...
      // map filter reduce some every find findIndex indexOf includes
      /*
        以下不会修改原数组：
          map  长度不变，值变
            返回一个新数组。长度不变，值变（新数组的长度和原数组一样，但是新数组中每一项值往往会发生变化）
          filter 长度变（少），值不变
            返回一个新数组。
            返回true保留，返回false过滤
          reduce 长度和值都变
            统计、累加、求和等功能。
            arr.reduce((previous, current, index, array) => {
              // previous第一次遍历的值是initValue
              // previous第二次遍历以后的值，是上一次遍历的返回值
              // current就是遍历的item
            }, initValue)
            arr.reduce((p, c) => {}, initValue)
            
          some 只有一个为true，就返回true，只有全部是false，才返回false
          every 只有全部是true，就返回true，只要有一个false，就返回false

          数组元素是引用类型（对象）
            find 查找某个元素，找到了返回这个元素，没有找到返回undefined
            findIndex 查找某个元素的下标，找到了返回这个元素的下标，没有找到返回-1
          数组元素是基本类型
            indexOf 查找某个元素的下标
            includes 查找某个元素是否存在，返回布尔值
      */
      if (this.searchOptions.props.includes(prop)) return;
      this.searchOptions.props.push(prop);
      this.searchGoodsList();
    },
    // 删除分类参数
    delCategory() {
      this.$router.push({
        name: "Search",
        query: {
          keyword: this.$route.query.keyword,
        },
      });
    },
    // 删除关键字参数
    delKeyword() {
      this.$router.push({
        name: "Search",
        query: {
          ...this.$route.query,
          keyword: undefined, // undefined参数不会再页面显示
        },
      });
    },
    // 删除品牌参数
    delTrademark() {
      this.searchOptions.trademark = "";
      this.searchGoodsList();
    },
    // 删除属性参数
    delProp(index) {
      this.searchOptions.props.splice(index, 1);
      this.searchGoodsList();
    },
    // 设置排序
    setOrder(orderType) {
      let [oldOrderType, oldOrderFlag] = this.order;
      /*
        点击相同的取反
        点击不同的降序
      */
      if (oldOrderType === orderType) {
        oldOrderFlag = oldOrderFlag === "asc" ? "desc" : "asc";
      } else {
        oldOrderFlag = "desc";
      }
      // 更新了搜索条件
      this.searchOptions.order = `${orderType}:${oldOrderFlag}`;

      this.searchGoodsList();
    },

    handleSizeChange(pageSize) {
      this.searchOptions.pageSize = pageSize;
      this.searchGoodsList();
    },
    handleCurrentChange: debounce(
      function (currentPage) {
        this.searchOptions.pageNo = currentPage;
        this.searchGoodsList();
      },
      200,
      { maxWait: 5000 }
    ),
  },
  watch: {
    // 分类和关键字搜索
    $route() {
      // 只要路由参数发生了变化，监视属性就会触发
      this.searchGoodsList();
    },
  },
  computed: {
    order() {
      return this.searchOptions.order.split(":");
    },
  },
};
</script>

<style lang="less" scoped>
.main {
  margin: 10px 0;

  .py-container {
    width: 1200px;
    margin: 0 auto;

    .bread {
      margin-bottom: 5px;
      overflow: hidden;

      .sui-breadcrumb {
        padding: 3px 15px;
        margin: 0;
        font-weight: 400;
        border-radius: 3px;
        float: left;

        li {
          display: inline-block;
          line-height: 18px;

          a {
            color: #666;
            text-decoration: none;

            &:hover {
              color: #4cb9fc;
            }
          }
        }
      }

      .sui-tag {
        margin-top: -5px;
        list-style: none;
        font-size: 0;
        line-height: 0;
        padding: 5px 0 0;
        margin-bottom: 18px;
        float: left;

        .with-x {
          font-size: 12px;
          margin: 0 5px 5px 0;
          display: inline-block;
          overflow: hidden;
          color: #000;
          background: #f7f7f7;
          padding: 0 7px;
          height: 20px;
          line-height: 20px;
          border: 1px solid #dedede;
          white-space: nowrap;
          transition: color 400ms;
          cursor: pointer;

          i {
            margin-left: 10px;
            cursor: pointer;
            font: 400 14px tahoma;
            display: inline-block;
            height: 100%;
            vertical-align: middle;
          }

          &:hover {
            color: #28a3ef;
          }
        }
      }
    }

    .details {
      margin-bottom: 5px;

      .sui-navbar {
        overflow: visible;
        margin-bottom: 0;

        .filter {
          min-height: 40px;
          padding-right: 20px;
          background: #fbfbfb;
          border: 1px solid #e2e2e2;
          padding-left: 0;
          border-radius: 0;
          box-shadow: 0 1px 4px rgba(0, 0, 0, 0.065);

          .sui-nav {
            position: relative;
            left: 0;
            display: block;
            float: left;
            margin: 0 10px 0 0;

            li {
              float: left;
              line-height: 18px;

              a {
                display: block;
                cursor: pointer;
                padding: 11px 15px;
                color: #777;
                text-decoration: none;
              }

              &.active {
                a {
                  background: #e1251b;
                  color: #fff;
                }
              }
            }
          }
        }
      }

      .goods-list {
        margin: 20px 0;

        ul {
          display: flex;
          flex-wrap: wrap;

          li {
            height: 100%;
            width: 20%;
            margin-top: 10px;
            line-height: 28px;

            .list-wrap {
              .p-img {
                padding-left: 15px;
                width: 215px;
                height: 255px;

                a {
                  color: #666;

                  // img {
                  //   max-width: 100%;
                  //   height: auto;
                  //   vertical-align: middle;
                  // }
                }
              }

              .price {
                padding-left: 15px;
                font-size: 18px;
                color: #c81623;

                strong {
                  font-weight: 700;

                  i {
                    margin-left: -5px;
                  }
                }
              }

              .attr {
                padding-left: 15px;
                width: 85%;
                overflow: hidden;
                margin-bottom: 8px;
                min-height: 38px;
                cursor: pointer;
                line-height: 1.8;
                display: -webkit-box;
                -webkit-box-orient: vertical;
                -webkit-line-clamp: 2;

                a {
                  color: #333;
                  text-decoration: none;
                }
              }

              .commit {
                padding-left: 15px;
                height: 22px;
                font-size: 13px;
                color: #a7a7a7;

                span {
                  font-weight: 700;
                  color: #646fb0;
                }
              }

              .operate {
                padding: 12px 15px;

                .sui-btn {
                  display: inline-block;
                  padding: 2px 14px;
                  box-sizing: border-box;
                  margin-bottom: 0;
                  font-size: 12px;
                  line-height: 18px;
                  text-align: center;
                  vertical-align: middle;
                  cursor: pointer;
                  border-radius: 0;
                  background-color: transparent;
                  margin-right: 15px;
                }

                .btn-bordered {
                  min-width: 85px;
                  background-color: transparent;
                  border: 1px solid #8c8c8c;
                  color: #8c8c8c;

                  &:hover {
                    border: 1px solid #666;
                    color: #fff !important;
                    background-color: #666;
                    text-decoration: none;
                  }
                }

                .btn-danger {
                  border: 1px solid #e1251b;
                  color: #e1251b;

                  &:hover {
                    border: 1px solid #e1251b;
                    background-color: #e1251b;
                    color: white !important;
                    text-decoration: none;
                  }
                }
              }
            }
          }
        }
      }

      .page {
        display: flex;
        justify-content: center;
      }
    }
  }
}

.goods-img {
  width: 230px;
  height: 255px;
}
</style>
